#! /bin/sh
# SPDX-License-Identifier: GPL-2.0-or-later

img=${1:-"exfat.img"}

truncate -s 32M $img
mkfs.exfat $img >> /dev/null
dump_info=$(dump.exfat $img)
upcase_entry_off=$(echo "${dump_info}" | grep "Upcase table entry position:" | cut -d ':' -f 2)

# Make FirstCluster field corrupted
start_clu_off=$((${upcase_entry_off}+20))
echo "$(printf "%x" $start_clu_off):0x00" | xxd -r - $img